<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>水果购物车</title>
  <script src="../../../vue.js"></script>
  <link rel="stylesheet" href="./inputnumber.css" />
  <link rel="stylesheet" href="./index.css" />
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="../img/fruit.jpg" alt="" /></div>

    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>

    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>

        <!-- 身体 -->
        <div class="tbody" v-if="fruitList.length > 0">

          <div class="tr" :class="{active: item.isChecked}" v-for="(item,index) in fruitList" :key="item.id">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{item.price}}</div>
            <div class="td">
              <div class="my-input-number">
                <button :disabled="item.num <=1" class="decrease" @click="sub(item.id)"> - </button>
                <span class="my-input__inner">{{item.num}}</span>
                <button class="increase" @click="add(item.id)"> + </button>
              </div>
            </div>
            <div class="td">{{item.num * item.price}}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>
        </div>
      </div>

      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isAll" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{totalPrice}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{totalCount}} )</button>
        </div>
      </div>
    </div>
  </div>
  <!-- 空车 -->
  <div class="empty" v-else>🛒空空如也</div>

  </div>

  <script>
    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        fruitList: JSON.parse(localStorage.getItem('fruitList')) ||
          [
            {
              id: 1,
              icon: '../img/火龙果.png',
              isChecked: true,
              num: 2,
              price: 6,
            },
            {
              id: 2,
              icon: '../img/荔枝.png',
              isChecked: false,
              num: 7,
              price: 20,
            },
            {
              id: 3,
              icon: '../img/榴莲.png',
              isChecked: false,
              num: 3,
              price: 40,
            },
            {
              id: 4,
              icon: '../img/鸭梨.png',
              isChecked: true,
              num: 10,
              price: 3,
            },
            {
              id: 5,
              icon: '../img/樱桃.png',
              isChecked: false,
              num: 20,
              price: 34,
            },
          ],
      },
      methods: {
        del(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
          // localStorage.setItem('fruitList', JSON.stringify(this.fruitList))
        },
        sub(id) {
          // 根据id找对应项
          const fruit = this.fruitList.find(item => item.id === id)
          if (fruit.num >= 0) {
            fruit.num--
            // localStorage.setItem('fruitList', JSON.stringify(this.fruitList))
          } else {
            alert("不能再减少了")
          }
        },
        add(id) {
          // 根据id找对应项
          const fruit = this.fruitList.find(item => item.id === id)
          fruit.num++
          // localStorage.setItem('fruitList', JSON.stringify(this.fruitList))
        }
      },
      computed: {
        // isAll() {
        //   // 当所有小选框都选中的时候,全选按钮才选上  every
        //   return this.fruitList.every(item => item.isChecked === true)
        // }
        isAll: {
          get() {
            // localStorage.setItem('fruitList', JSON.stringify(this.fruitList))
            return this.fruitList.every(item => item.isChecked === true)
          },
          set(newValue) {
            console.log(newValue);  // true or false
            // 拿到这个值,让所有的小选框同步这个状态
            // 遍历
            this.fruitList.forEach(item => item.isChecked = newValue)
            // localStorage.setItem('fruitList', JSON.stringify(this.fruitList))
          }
        },
        // 总的数量
        totalCount() {
          return this.fruitList.reduce((prev, item) => item.isChecked ? prev + item.num : prev, 0)
        },
        // 总价
        totalPrice() {
          return this.fruitList.reduce((prev, item) => item.isChecked ? prev + item.num * item.price : prev, 0)
        }
      },
      watch: {
        fruitList: {
          deep: true,
          handler(newValue) {
            console.log(newValue);
            localStorage.setItem('fruitList', JSON.stringify(newValue))

          }
        }
      }
    })
  </script>
</body>

</html>